Note 120 — Chapter XV · IRON AND CHROME TANNAGES.
Reading edition
Martin Dennis, U.S.A. Pat. 495028, 1893; and 511411, 1893, 7732, 1893. E. Pat. Gallagher.
[121] Leather Trades Review, Jan. 12, 1897.
[122] Compare Eberle’s German patents, 119042, 1898, and 130678, 1899. The last of these appears to be anticipated, at least as regards the use of glucose, sugar and starch, by the writer’s publication in 1897 above cited.
[123] Leather Trades Review. Later investigations have shown that the temperature of the water is unimportant if alkali be added, but chrome-alum dissociates to some extent in hot water, and comparative experiments have shown that solutions of the normal salt made with the aid of heat act on skin as if more acid than those made in the cold.